. >> this is possibly the greatest point cluster which has occurred certainly in the united states that i'm aware of. >> early symptoms can take up to six weeks to appear, and include fatigue, fever and chills. those quickly give way to coughing and breathing problems as the lungs fill with fluid. the worst part is there is no known treatment or cure. >> there's really nothing you can do preemptively if you are exposed to hantavirus. >> for one of america's oldest and most popular national parks, a serious threat. yosemite's majestic beauty attracts visitors worldwide. now that could mean a worldwide public health hazard. david wright, abc news, los angeles. >>> the california department of public health is expanding its recall of red vines candy made in the union city production center. in addition to the black licorice products recalled last month, the apa is warning these other products could have more than the allowable amount of lead. added is family mix, mixed bites, snaps and black licorice twists. the bags are labeled with expiration dates of february, 2013. eating the candy cou